Élaboration par projection plasma d'un revêtement bicouche d'alumine réfléchissant et diffusant. Contribution à la compréhension des phénomènes interaction rayonnement/matière

Abstract : This study deals with the manufacturing of reflecting and scattering coatings by plasma spraying process. By the selection of operating parameters and the control of the coatings microstructure, the first part of this work presents the elaboration of a micro/nanostructured bilayer material in alumina with a reflectance up to 90 % in the near UV-Visible range of wavelength. The feasibility of larger pieces (0.25m2) is demonstrated and the different characterizations for inserting the material in the Laser MegaJoule are performed. In a second part, from characterizations of the microstructure (by SEM, Hg Porosimetry, USAXS) and the chemical composition (DRX, X fluorescence), the improvement of the reflectance in the near-UV thanks to the nanostructured layer is explained, on the one hand, by the less absorbing crystallographic phase and, on the other hand, by the smaller and numerous pores. Moreover, the characterization of the radiation properties by the Radiation Transfer Equation inversion brings new elements for understanding the phenomena during radiation/porous media interaction and to determine the spatial repartition of the scattering radiation. The aim of the last part is to set up the different tools which are necessary to compute simulations of plasma-sprayed coatings optical behavior. From the microstructure analysis, a tridimensional numerical representation of each layer is suggested. The resolution of Maxwell equations is performed by FDTD (Finite Difference Time Domain) method. The model is validated and some first simulations are realized
Complete list of metadatas

https://hal.univ-lorraine.fr/tel-01750539
Contributor : Thèses Ul <>
Submitted on : Thursday, March 29, 2018 - 12:48:50 PM
Last modification on : Tuesday, April 10, 2018 - 1:28:04 AM

File

DDOC_T_2013_0258_MARTHE.pdf
Files produced by the author(s)

Identifiers

  • HAL Id : tel-01750539, version 1

Collections

Citation

Jimmy Marthe. Élaboration par projection plasma d'un revêtement bicouche d'alumine réfléchissant et diffusant. Contribution à la compréhension des phénomènes interaction rayonnement/matière. Autre [cond-mat.other]. Université de Lorraine, 2013. Français. ⟨NNT : 2013LORR0258⟩. ⟨tel-01750539⟩

Share

Metrics

Record views

31

Files downloads

38